Improvement in sewing-machines



C. W. HOWARD.

Improvement in Sewing-Machinm No 126,057. Pate med Apri|23,1872.

ATENT, Orrron CHARLES W. HOWARD, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 126,057, dated April23, 1872.

Specification of an Improvement in Sewing- Machines, invented by CHARLESW. HOWARD, of Philadelphia city and county, and State of Pennsylvania.

This invention relates to the portion of a sewing-machine whichregulates the supply of thread from the upper spool; and in the drawingis illustrated in its application to a hookmachine described by me in anapplication for Letters Patent of the United States, filed December16,1871.

Each revolution of the hook, after the first stitch is made, draws up aquantity of upper thread equal to the amount contained in the looppassed around the bobbin-case plus the length of the stitch determinedby the forward feeding mechanism moving the cloth. This latter quantityof thread must be furnished at each revolution of the hook from thespool, and it is to that portion of the mechanism which regulates thissupply of thread from the spool that this application relates. The spoolturns freely upon a spindle attached to the frame of the machine, andthe thread therefrom is passed through an eye, B, fastened to theneedle-bar lever; it is then passed around the tension-disk G, thenagain through the eye B, then through another eye attached also to thesaid lever, then through the thread-tube E in the upper end of theneedle-bar, and thence, extending downward, it is passed through the eyeof the needle F.

This mode of attaching the spool is in common use; the tension-disk isalso well known, and is constructed so that the degree of tension may bedetermined; all of which, being well known to those skilled in the artof constructing sewing-machines, need not be described herein. The tubein the upper end of the needle-bar is also in common use. The needlewhich I prefer to use in this connection is a needle having a groove onboth sides extending upward from the eye to relieve the thread fromstrain in sewing through thick goods. In former machines of the classmentioned the thread has passed from the spool to the tension-disk, andthence either direct to the tube in the needle-bar, or intermediatelythrough an eye attached to the arm or some other stationary part of themachine.

What I claim as my invention, and desire to secure by Letters Patent, isp The vibrating arm and its thread-guiding eyes, the tension-disk, andthe needle-bar provided with its threadguiding eye, all arranged withrelation to each other, as described, and

so that the arm at the commencement of its descent will draw from thedisk just enough thread to form a stitch, as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

. CHARLES W. HOWARD. Witnesses:

R. MASON, A. RUPPERT.

